Comparing IPv4 and IPv6 Addressing

As I preparing for 70-410 I just realized that I HAVE TO memorize some IPv6 related things, so hence this table was taken from MSFT documentation and slightly colored by me:


You may benefit from reading entire “Chapter 3 – IP Addressing” from ” TCP/IP Fundamentals for Windows” available on TechNet if you in a mood for going into details.

It is useful to memorize common prefixes for the exam and for practical purposes:

2000::/3 prefix for a globally unique IPv6 address (can be 2001/2002). It is equivalent to a public IPv4 address. Assigned by IANA. The full address will include a value representing the organization’s site, a subnet identifier, and host address.

FC00::/7 is the prefix used for a unique local unicast address (also FD00:://8). This is used in a private network like a private IPv4 address. Address values are unique only to that network and are routable only through the network. The address is not publically routable.

FE80::/64 prefix for link-local unicast address, which is equivalent to an IPv4 APIPA address. It is generated automatically when a network adapter is not configured with an IPv6 address and cannot lease an address from a DHCP server. This is not routable address. Even if you have DHCP or statically assigned IPv6 address you still going to have auto generated link-local address. This address is randomly generated, and in the past MSFT implementation used to insert MAC address into it, now MAC address no longer inserted into it.

FF00::/8 prefix for IPv6 multicast address

FEC0::/10 is a site-local address. Though still documented by many sources, the use of this prefix has been deprecated.




Leave a Reply

Your email address will not be published. Required fields are marked *